<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>01JS的三种引入方式</title>
</head>
<body>
       <button onclick="alert('请先登录')">点击即玩</button>
       <button onclick="console.log('点我干嘛')">点击即玩2</button>

       <h1 id="h1">我是一级标题</h1>
        <script>1
            console.log(h1);
        </script>
       <script src="01.js">
           console.log('你看看你爹');
       </script>
</body>
</html>